65644004 has 24 divisors (see below), whose sum is σ = 121976568. Its totient is φ = 30804480.

The previous prime is 65644003. The next prime is 65644027. The reversal of 65644004 is 40044656.

It can be written as a sum of positive squares in 4 ways, for example, as 357604 + 65286400 = 598^2 + 8080^2 .

It is a super-2 number, since 2×65644004² = 8618270522304032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65644003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27482 + ... + 29774.

It is an arithmetic number, because the mean of its divisors is an integer number (5082357).

Almost surely, 2^65644004 is an apocalyptic number.

It is an amenable number.

65644004 is a deficient number, since it is larger than the sum of its proper divisors (56332564).

65644004 is a wasteful number, since it uses less digits than its factorization.

65644004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2735 (or 2733 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 65644004 is about 8102.0987404499. The cubic root of 65644004 is about 403.3960931109.

The spelling of 65644004 in words is "sixty-five million, six hundred forty-four thousand, four".